Investigating the Frequency Spectrum Characteristic of Stress Wave under Multistage Loading Stress

Figure 10

Total energy of frequency band. (a) 0 MPa. (b) 2.76 MPa. (c) 11.04 MPa. (d) 19.32 MPa. (e) 27.60 MPa. (f) 33.12 MPa.

(a)

(b)

(c)

(d)

(e)

(f)